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1 History  





2 Composition and classification  





3 See also  





4 References  





5 External links  














Yamato 691






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Coordinates: 71°50S 36°15E / 71.833°S 36.250°E / -71.833; 36.250
 

From Wikipedia, the free encyclopedia
 


Yamato 691
TypeChondrite
ClassEnstatite chondrite
CompositionPl (An32-75), En-99.2, Wo-0.3, tro., nini., oldh., perr., schr., metal (2.2–2.5% Ni, 0.16–0.22% CO)[1]
CountryAntarctica
RegionQueen Fabiola Mountains (Yamato Mountains)
Coordinates71°50′S 36°15′E / 71.833°S 36.250°E / -71.833; 36.250[2]
Observed fallNo
Fall date4.5 billion years ago
Found dateDecember 21, 1969
TKW715 grams (1.576 lb)

The Yamato 691 (abbreviated Y-691) is a 4.5 billion year old chondrite meteorite discovered by members of the Japanese Antarctic Research Expedition[3] on the blue ice field of the Queen Fabiola Mountains (Yamato Mountains) in Antarctica, on December 21, 1969.[2]

History[edit]

Yamato 691 was one among 9 meteorite specimens identified by the Japanese Expedition Team in 1969. It was later studied at the Max Planck Institute for Chemistry, Mainz, Germany.[4]

In April 2011, NASA and co-researchers from the United States, South Korea and Japan have found a new mineral named "Wassonite" in Yamato 691.[5]

Composition and classification[edit]

This meteorite is a stony enstatite chondrite. Minerals reported from the meteorite include:[6]

See also[edit]

References[edit]

  1. ^ "Catalog of Antarctic Meteorites" (PDF). Tokyo: National Institute of Polar Research. 2000. Retrieved 2011-04-07.
  • ^ a b "Yamato 691". The Meteoritical Society. Retrieved 2011-04-07.
  • ^ Dwayne C. Brown; William Jeffs (2011-04-05). "Scientists Find New Type Of Mineral In Historic Meteorite". NASA. Retrieved 2011-04-07.
  • ^ Clarke, R. S. Jr. (1974). "Meteoritical Bulletin, No. 52". Meteoritics. 9: 118. Bibcode:1974Metic...9..101C. Retrieved 2011-04-07.
  • ^ Bryner, Jeanna (2011-04-06). "4.5-Billion-Year-Old Antarctic Meteorite Yields New Mineral". LiveScience. Retrieved 2011-04-07.
  • ^ "Yamato 691 Meteorite, Queen Fabiola Mountains (Yamato Mountains), Antarctica". Retrieved 2011-04-07.
  • External links[edit]


    Retrieved from "https://en.wikipedia.org/w/index.php?title=Yamato_691&oldid=1187060962"

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    This page was last edited on 27 November 2023, at 06:08 (UTC).

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